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Black Hole

7Bil BC
 About this time, when the universe was about half its current age, two stellar black holes crashed into each other. One was 66 times the mass of the sun and the other a husky 85 times the mass of the sun. The result was an intermediate black hole, 142 times the mass of the sun. This was detected by scientists in 2019.
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3.7Bil BC
 In 2013 NASA telescopes recorded a massive, record-setting gamma ray burst, indicating the death of a star and the formation of a black hole, 3.7 billion light-years away.
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2Bil BC
 Astronomers in 2010 noticed that a galaxy quickly increased in brightness by a factor of hundreds. Over the next year a star was ripped apart and devoured by a black hole. Light from this event had taken about 2 billion years to reach Earth.
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1.3Bil BC
 Two black holes collided about this time to form a single black hole and in the process sent out gravitational waves (GW150914) that were detected by the LIGO project on Sep 14, 2015.
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1793 Apr 29
 John Michell (b.1724) English clergyman and natural philosopher, died in Yorkshire. He provided pioneering insights in a wide range of scientific fields, including astronomy, geology, optics, and gravitation. Michell was the first person to propose that black holes existed.
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1965
 Dr. Roger Penrose (b.1931), English mathematical physicist, mathematician and philosopher of science, worked out the specifics of how real matter could collapse in a way to form a black hole.
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1996 Feb 21
 The Space Telescope Science Institute announced that photographs from the Hubble Space Telescope confirmed the existence of a "black hole" equal to the mass of two billion suns in a galaxy some 30 million light-years away.
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1996 May
 Scientists detected powerful bursts of gamma rays suspected to be from a super massive black hole at the heart of the Markarian 421 elliptical galaxy. The distance to the galaxy is 400 Million light years and it is far larger than the Milky Way.
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2003 Mar 29
 A gamma ray burst was detected as a giant star exploded and collapsed into a black hole some 2 billion light years away in the direction of the constellation Leo.
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2004 Feb 18
 Scientists reported that X-rays from galaxy RX J1242-11 indicated a black hole tearing apart a star and gobbling up a share of its gaseous mass.
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2004 Jul 21
 Stephen Hawking presented findings that contradicted his earlier work on black holes and said black holes form an apparent horizon from which information can eventually escape. This change lost him a 1977 bet with Dr. Preskill of CalTech.
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2005 Nov 2
 Chinese scientists said they had gathered evidence that shows a giant object in the center of our galaxy is a super-massive black hole.
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2007 Oct 30
 NASA said US astronomers have discovered the biggest black hole orbiting a star 1.8 million light-years from Earth in the constellation Cassiopeia, with a record-setting mass of 24 to 33 times that of our Sun.
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2008 Apr 3
 It was reported that Nikolai Shaposhnikov and Lev Titarchuk had discovered a small black hole in the Milky Way with the aid of NASA's Rossi X-ray Timing Explorer satellite. They presented the findings earlier this week at an American Astronomical Society conference. It was discovered alongside a normal star in a binary system called XTE J1650-500, named for its coordinates in the constellation Ara. The system was discovered in 2001.
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2011 Jun 15
 A team of int’l. astronomers reported the finding of the oldest black holes ever observed. Their observations put the black holes 13 billion light years from Earth, meaning that they were being observed just as they looked 1 billion years after the formation of the universe.
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2011 Dec 5
 A team led by astronomers at the University of California, Berkeley, reported the discovery of two gigantic black holes, each one 10 billion times the mass of our sun, in clusters of elliptical galaxies more than 300 million light years away.
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2013 Apr 27
 NASA telescopes recorded a massive, record-setting gamma ray burst, indicating the death of a star and the formation of a black hole, 3.7 billion light-years away.
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2016 Feb 11
 Scientists at the Advanced Laser Interferometer Gravitational-wave Observatory (LIGO) announced the detection of the first gravitational wave recorded last September 14. It stemmed from the merger of two black holes some 1.3 billion years earlier. The LIGO project broke ground in Hanford, Washington in late 1994 and in Livingston, Louisiana in 1995.
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2016 Feb 17
 A Japanese satellite, developed in collaboration with NASA and various other groups, was launched. It was designed to observe X-rays emanating from black holes and galaxy clusters. On March 27 the director of Japan’s Institute of Space and Astronautical Science said the satellite has disappeared.
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2019 Apr 10
 Astronomers unveiled visual evidence of a massive black hole in the Messier 87 galaxy, 55 million light-years from Earth. The black hole was said to be about 7 billion times more massive that the sun.
Links: Astronomy, Black Hole     Click to see the source(s) for this event 
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2020 May 6
 It was reported that European astronomers have found the closest black hole to Earth yet, so near that the two stars dancing with it can be seen by the naked eye. This black hole is about 1,000 light-years away in the constellation Telescopium in the Southern Hemisphere.
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2020 Oct 6
 Three scientists were jointly awarded the Nobel Prize in Physics today for their work on understanding black holes, which the committee called “one of the most exotic phenomena in the universe.” The prize was awarded half to Roger Penrose of Britain for showing how black holes could form and half to Reinhard Genzel of Germany and Andrea Ghez of UCLA for discovering a supermassive object at the Milky Way’s center.
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